Finding the Fourth Proportional to 21,978.12, 30,329.58 and 12,546.36

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.12 : 30,329.58 = 12,546.36 : x
2. Step 2: Convert to fraction form
   21,978.12/30,329.58 = 12,546.36/x
3. Step 3: Cross multiply
   21,978.12x = 30,329.58 × 12,546.36
4. Step 4: Simplify right side
   21,978.12x = 380,525,829.33
5. Step 5: Solve for x
   x = 380,525,829.33/21,978.12
6. Step 6: Final answer
   x = 17,313.85